Stellar Collapse Dynamics With Neutrino Flavor Changing Neutral Currents

Details Stellar Collapse Dynamics With Neutrino Flavor Changing Neutral Currents Stellar Collapse Dynamics With Neutrino Flavor Changing Neutral Currents

2006-06-24

arxiv.org/abs/astro-ph/0606607v3

Phys.Rev.D75:083008,2007

Astronomy and Astrophysics

Astrophysics

28 pages, 4 figures, some new text added

Scientific paper

10.1103/PhysRevD.75.083008

We perform one-zone simulations of the infall epoch of a pre-supernova stellar core in the presence of neutrino flavor changing scattering interactions. Our calculations give a self-consistent assessment of the relationship between flavor changing rates and the reduction in electron fraction and re-distribution of initial electron lepton number among the neutrino flavors. We discuss and include in our calculations sub-nuclear density medium corrections for flavor changing scattering coherence factors. We find that flavor changing couplings epsilon > 3x10^(-4) in either the electron neutrino - muon neutrino or electron neutrino - tau neutrino channels result in a dynamically significant reduction in core electron fraction relatively soon after neutrino trapping and well before the core reaches nuclear matter density.

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